Not really that hard to get up on the roof. One person on the roof to pull the rope other person on the ground. Leave the unit in the box, wrap rope around it and push and pull it up an extension ladder. If the unit is truely preped for 2nd air the wires will be tucked under the vent bezel and the manufacturer can tell you where the thermostat wire is buried in the wall. Check and see if the existing ducts terminate at your existing vent cover and if they do I would install a unit that can hook into the existing duct work